His sharp-tongued comments always make his colleagues uncomfortable.

sharp-tongued 是由形容词 sharp（尖锐的）和名词 tongue（舌头）加上后缀 -ed 组成的复合形容词。sharp 在这里比喻"言辞犀利的"，tongue 引申为"说话方式"。 sharp-tongued 形容一个人说话尖酸刻薄、言辞犀利，常带有批评或讽刺的意味。